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Methods of separating and purifying substances

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Question 39

The Rf R_f\,Rf​ value of a food colouring dye can be calculated using the equation:

Rf=distance moved by the dyedistance moved by the solvent front R_f = \frac{\text{distance moved by the dye}}{\text{distance moved by the solvent front}} Rf​=distance moved by the solvent frontdistance moved by the dye​

In a paper chromatography experiment, a blue dye moved 4.80 cm from the start line, while the solvent front moved a distance of 7.40 cm.

Calculate the Rf R_f\,Rf​ value for this blue dye.

Give your answer to 2 decimal places.

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Methods of separating and purifying substances Questions

  1. GCSE
  2. /Chemistry
  3. /Methods of separating and purifying substances